rt-thread/examples/kernel/memp_simple.c

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 *
 */

/*
 * 程序清单：内存池例程
 *
 * 这个程序会创建一个静态的内存池对象，2个动态线程。两个线程会试图分别从内存池中获得
 * 内存块
 */
#include <rtthread.h>
#include "tc_comm.h"

static rt_uint8_t *ptr[48];
static rt_uint8_t mempool[4096];
static struct rt_mempool mp;

/* 指向线程控制块的指针 */
static rt_thread_t tid1 = RT_NULL;
static rt_thread_t tid2 = RT_NULL;

/* 线程1入口 */
static void thread1_entry(void* parameter)
{
    int i;
    char *block;

    while(1)
    {
        for (i = 0; i < 48; i++)
        {
            /* 申请内存块 */
            rt_kprintf("allocate No.%d\n", i);
            if (ptr[i] == RT_NULL)
            {
                ptr[i] = rt_mp_alloc(&mp, RT_WAITING_FOREVER);
            }
        }

        /* 继续申请一个内存块，因为已经没有内存块，线程应该被挂起 */
        block = rt_mp_alloc(&mp, RT_WAITING_FOREVER);
        rt_kprintf("allocate the block mem\n");
        /* 释放这个内存块 */
        rt_mp_free(block);
        block = RT_NULL;
    }
}

/* 线程2入口，线程2的优先级比线程1低，应该线程1先获得执行。*/
static void thread2_entry(void *parameter)
{
    int i;

    while(1)
    {
        rt_kprintf("try to release block\n");

        for (i = 0 ; i < 48; i ++)
        {
            /* 释放所有分配成功的内存块 */
            if (ptr[i] != RT_NULL)
            {
                rt_kprintf("release block %d\n", i);

                rt_mp_free(ptr[i]);
                ptr[i] = RT_NULL;
            }
        }

        /* 休眠10个OS Tick */
        rt_thread_delay(10);
    }
}

int mempool_simple_init()
{
    int i;
    for (i = 0; i < 48; i ++) ptr[i] = RT_NULL;

    /* 初始化内存池对象 */
    rt_mp_init(&mp, "mp1", &mempool[0], sizeof(mempool), 80);

    /* 创建线程1 */
    tid1 = rt_thread_create("t1",
                            thread1_entry, RT_NULL, /* 线程入口是thread1_entry, 入口参数是RT_NULL */
                            THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
    if (tid1 != RT_NULL)
        rt_thread_startup(tid1);
    else
        tc_stat(TC_STAT_END | TC_STAT_FAILED);

    /* 创建线程2 */
    tid2 = rt_thread_create("t2",
                            thread2_entry, RT_NULL, /* 线程入口是thread2_entry, 入口参数是RT_NULL */
                            THREAD_STACK_SIZE, THREAD_PRIORITY + 1, THREAD_TIMESLICE);
    if (tid2 != RT_NULL)
        rt_thread_startup(tid2);
    else
        tc_stat(TC_STAT_END | TC_STAT_FAILED);

    return 0;
}

#ifdef RT_USING_TC
static void _tc_cleanup()
{
    /* 调度器上锁，上锁后，将不再切换到其他线程，仅响应中断 */
    rt_enter_critical();

    /* 删除线程 */
    if (tid1 != RT_NULL && tid1->stat != RT_THREAD_CLOSE)
        rt_thread_delete(tid1);
    if (tid2 != RT_NULL && tid2->stat != RT_THREAD_CLOSE)
        rt_thread_delete(tid2);

    /* 执行内存池脱离 */
    rt_mp_detach(&mp);

    /* 调度器解锁 */
    rt_exit_critical();

    /* 设置TestCase状态 */
    tc_done(TC_STAT_PASSED);
}

int _tc_mempool_simple()
{
    /* 设置TestCase清理回调函数 */
    tc_cleanup(_tc_cleanup);
    mempool_simple_init();

    /* 返回TestCase运行的最长时间 */
    return 100;
}
/* 输出函数命令到finsh shell中 */
FINSH_FUNCTION_EXPORT(_tc_mempool_simple, a memory pool example);
#else
/* 用户应用入口 */
int rt_application_init()
{
    mempool_simple_init();

    return 0;
}
#endif